mdw@git.distorted.org.uk Git - qmail/blob - BLURB3

   1 Here are some of qmail's features.
   2
   3 Setup:
   4 *  automatic adaptation to your UNIX variant---no configuration needed
   5 *  AIX, BSD/OS, FreeBSD, HP/UX, Irix, Linux, OSF/1, SunOS, Solaris, and more
   6 *  automatic per-host configuration (qmail-config)
   7 *  quick installation---no big list of decisions to make
   8
   9 Security:
  10 *  clear separation between addresses, files, and programs
  11 *  minimization of setuid code (qmail-queue)
  12 *  minimization of root code (qmail-start, qmail-lspawn)
  13 *  five-way trust partitioning---security in depth
  14 *  optional logging of one-way hashes, entire contents, etc. (QUEUE_EXTRA)
  15
  16 Message construction (qmail-inject):
  17 *  RFC 822, RFC 1123
  18 *  full support for address groups
  19 *  automatic conversion of old-style headers to RFC 822 format
  20 *  header line length limited only by memory
  21 *  host masquerading (control/defaulthost)
  22 *  user masquerading (MAILUSER, MAILHOST)
  23 *  sendmail hook for compatibility with current user agents
  24
  25 SMTP service (qmail-smtpd):
  26 *  RFC 821, RFC 1123, RFC 1651, RFC 1652, RFC 1854
  27 *  8-bit clean
  28 *  931/1413/ident/TAP callback (tcp-env)
  29 *  relay control---stop unauthorized relaying by outsiders (control/rcpthosts)
  30 *  no interference between relay control and forwarding
  31 *  tcpd hook---reject SMTP connections from known abusers
  32 *  automatic recognition of local IP addresses
  33 *  per-buffer timeouts
  34 *  hop counting
  35
  36 Queue management (qmail-send):
  37 *  instant handling of messages added to queue
  38 *  parallelism limit (control/concurrencyremote, control/concurrencylocal)
  39 *  split queue directory---no slowdown when queue gets big
  40 *  quadratic retry schedule---old messages tried less often
  41 *  independent message retry schedules
  42 *  automatic safe queueing---no loss of mail if system crashes
  43 *  automatic per-recipient checkpointing
  44 *  automatic queue cleanups (qmail-clean)
  45 *  queue viewing (qmail-qread)
  46 *  detailed delivery statistics (qmailanalog, available separately)
  47
  48 Bounces (qmail-send):
  49 *  QSBMF bounce messages---both machine-readable and human-readable
  50 *  HCMSSC support---language-independent RFC 1893 error codes
  51 *  double bounces sent to postmaster
  52
  53 Routing by domain (qmail-send):
  54 *  any number of names for local host (control/locals)
  55 *  any number of virtual domains (control/virtualdomains)
  56 *  domain wildcards (control/virtualdomains)
  57 *  configurable percent hack support (control/percenthack)
  58 *  UUCP hook
  59
  60 SMTP delivery (qmail-remote):
  61 *  RFC 821, RFC 974, RFC 1123
  62 *  8-bit clean
  63 *  automatic downed host backoffs
  64 *  artificial routing---smarthost, localnet, mailertable (control/smtproutes)
  65 *  per-buffer timeouts
  66 *  passive SMTP queue---perfect for SLIP/PPP (serialmail, available separately)
  67
  68 Forwarding and mailing lists (qmail-local):
  69 *  address wildcards (.qmail-default, .qmail-foo-default, etc.)
  70 *  sendmail/smail /etc/aliases compatibility (qmsmac, available separately)
  71 *  mailing list owners---automatically divert bounces and vacation messages
  72 *  VERPs---automatic recipient identification for mailing list bounces
  73 *  Delivered-To---automatic loop prevention, even across hosts
  74 *  automatic subscription management (qlist)
  75
  76 Local delivery (qmail-local):
  77 *  user-controlled address hierarchy---fred controls fred-anything
  78 *  mbox delivery
  79 *  reliable NFS delivery (maildir)
  80 *  user-controlled program delivery: procmail etc. (qmail-command)
  81 *  optional new-mail notification (qbiff)
  82 *  optional NRUDT return receipts (qreceipt)
  83 *  conditional filtering (condredirect)
  84
  85 POP3 service (qmail-popup, qmail-pop3d):
  86 *  RFC 1939
  87 *  UIDL support
  88 *  TOP support
  89 *  APOP hook
  90 *  modular password checking (checkpassword, available separately)